"USB flash drives have been around for quite some time now. However, up until recently, there really wasn’t an easy way to install software to your flash drive so it was truly portable. Many programs require registry keys to work correctly or store their info in variety of different locations. This is were the Kingston U3 DataTraveler comes in, which features U3 technology. U3 technology allows anyone to easily install many different programs to their flash drive without worrying if the program will work when they plug the flash drive into a different computer. U3 compatible programs include Firefox, Thunderbird, Trillian, Gaim, OpenOffice, and many others."